The rate of deaths per 100 million miles traveled dropped to a record low. AP Photo The number of people dying on America's roads has fallen to its lowest level in six decades, helped by a combination of seat belts, safer cars and tougher enforcement of drunken driving laws.

The U.S. Transportation Department said late Wednesday that traffic deaths fell 9.7 percent in 2009 to 33,808, the lowest number since 1950.

In 2008, an estimated 37,423 people died on the highways.

Transportation Secretary Ray LaHood said the annual report "shows that America's roads are the safest they've ever been. But they must be safer. And we will not rest until they are."

Forty-one states, the District of Columbia and Puerto Rico saw reductions in highway fatalities, led by Florida with 422 fewer deaths and Texas, down 405.

The rate of deaths per 100 million miles traveled also dropped to a record low.

It fell to 1.13 deaths per 100 million miles in 2009, compared with 1.26 the year before.

Year-to-year declines in highway deaths have occurred in previous economic downturns, when fewer people are out on the road.

Traffic deaths decreased in the early 1980s and early 1990s when difficult economic conditions led many drivers to cut back on discretionary travel.

But last year's reduction in fatalities came even as the estimated number of miles traveled by motorists in 2009 increased 0.2 percent over 2008 levels.

Barbara Harsha, executive director for the Governors Highway Safety Association, attributed the improvements to more motorists wearing seat belts, better enforcement of drunken driving laws and enhanced vehicle safety features.

The annual highway safety report also found:

— Motorcycle fatalities broke a string of 11 years of annual increases, falling by 16 percent, from 5,312 in 2008 to 4,462 in 2009.

— The number of people injured in motor vehicle crashes fell for a 10th consecutive year.

— Alcohol-impaired driving deaths declined 7.4 percent in 2009 to 10,839 deaths, compared with 11,711 in 2008.